【摘要】 针对目前大多数茶园松土装置使用的旋耕刀区域针对性不强，不适用于南方山地丘陵地形，耕作效果不佳、耗能大、土壤保墒能力差等问题，应用离散元法对旋耕刀的工作过程进行动力学仿真和结构优化.以福建山地茶园土壤为试验样本，采用Hertz-Mindlin with Bonding模型作为土壤颗粒间的接触模型；以弯刀的正切面折弯角、弯曲半径和单刀切削幅宽为试验因素，设计三因素六水平的均匀试验，进行旋耕刀—土壤动力学仿真试验，以旋耕转轴扭矩和土壤扰动系数为评价指标.仿真试验结果表明，在折弯角128°、弯曲半径20 mm、单刀切削幅宽36 mm条件下，转轴扭矩值和土壤扰动系数都较小.更多还原

【Abstract】 Most rotary tiller is not applicable for tea garden located in southern mountainous and hilly regions, with poor tillage effect, high energy consumption, and poor soil moisture conservation ability. In this study, the working process of conventional rotary tiller was simulated by discrete element method for structural optimization. A contact model between soil particles was firstly established basing on Hertz-Mindlin with Bonding model. Then a dynamic simulation test, on the basis of uniformity test with 3 factors(tangential bending angle, bending radius and cutting width of the rotary blade) and 6 levels, was performed to evaluate the relationship between rotary tillage torque and soil disturbance coefficient based on soils collected from tea gardens of Fujian mountainous areas. The results showed lower rotary tillage torque and less soil disturbance when the bending angle was 128 °, the bending radius was 20 mm, and the cutting width reached 36 mm.更多还原